Blar i NTNU Open på forfatter "Limpasuvan, Varavut"
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Abrupt Change in the Lower Thermospheric Mean Meridional Circulation During Sudden Stratospheric Warmings and Its Impact on Trace Species
Orsolini, Yvan J.; Zhang, Jiarong; Limpasuvan, Varavut (Peer reviewed; Journal article, 2022)Based on the hourly output from the 2000–2014 simulations of the National Center for Atmospheric Research's vertically extended version of the Whole Atmosphere Community Climate Model in specified dynamics configuration, ... -
Characterisation of quasi-stationary planetary waves in the Northern MLT during summer
Stray, Nora Henriette; Espy, Patrick Joseph; Limpasuvan, Varavut; Hibbins, Robert (Journal article; Peer reviewed, 2015)Observations of planetary wave (PW) activity in the northern hemisphere, polar summer mesosphere and lower thermosphere (MLT) are presented. Meteor winds from a northern hemisphere chain of SuperDARN radars have been used ... -
Climatological Westward‐Propagating Semidiurnal Tides and Their Composite Response to Sudden Stratospheric Warmings in SuperDARN and SD‐WACCM‐X
Zhang, Z.; Limpasuvan, Varavut; Orsolini, Yvan J.; Espy, Patrick Joseph; Hibbins, Robert (Peer reviewed; Journal article, 2021)Using the Super Dual Auroral Radar Network observations (clustered around 60°N) and NCAR CESM2.0 extended Whole Atmosphere Community Climate Model nudged with reanalyzes, we examine the climatology of semidiurnal tides in ... -
The Composite Response of Traveling Planetary Waves in the Middle Atmosphere Surrounding Sudden Stratospheric Warmings through an Overreflection Perspective
Rhodes, Christian Todd; Limpasuvan, Varavut; Orsolini, Yvan Joseph Georges Emile G. (Peer reviewed; Journal article, 2023)Traveling planetary waves surrounding sudden stratospheric warming events can result from direct propagation from below or in situ generation. They can have significant impacts on the circulation in the mesosphere and lower ... -
Eastward-Propagating Planetary Waves Prior to the January 2009 Sudden Stratospheric Warming
Rhodes, Christian Todd; Limpasuvan, Varavut; Orsolini, Yvan J. (Peer reviewed; Journal article, 2021)Eastward-propagating planetary waves (EPWs) were investigated prior to the boreal January 2009 major sudden stratospheric warming (SSW) event simulated by the National Center for Atmospheric Research's Whole Atmosphere ... -
Impact of the Pacific sector sea ice loss on the sudden stratospheric warming characteristics
Zhang, Jiarong; Orsolini, Yvan J.; Limpasuvan, Varavut; Ukita, Jinro (Peer reviewed; Journal article, 2022)The atmospheric response to Arctic sea ice loss remains a subject of much debate. Most studies have focused on the sea ice retreat in the Barents-Kara Seas and its troposphere-stratosphere influence. Here, we investigate ... -
Modelling the descent of nitric oxide during the elevated stratopause event of January 2013
Orsolini, Yvan; Limpasuvan, Varavut; Pérot, Kristell; Espy, Patrick Joseph; Hibbins, Robert; Lossow, Stefan; Raaholt Larsson, Katarina; Murtagh, Donal (Journal article; Peer reviewed, 2017)Using simulations with a whole-atmosphere chemistry-climate model nudged by meteorological analyses, global satellite observations of nitrogen oxide (NO) and water vapour by the Sub-Millimetre Radiometer instrument (SMR), ... -
Observations of gravity wave forcing of the mesopause region during the January 2013 major Sudden Stratospheric Warming
De Wit, Rosmarie Johanna; Hibbins, Robert; Espy, Patrick Joseph; Orsolini, Yvan; Limpasuvan, Varavut; Kinnison, Douglas E. (Journal article; Peer reviewed, 2014)Studies of vertical and interhemispheric coupling during Sudden Stratospheric Warmings (SSWs) suggest that gravity wave (GW) momentum flux divergence plays a key role in forcing the middle atmosphere, although observational ... -
Observations of planetary waves in the mesosphere-lower thermosphere during stratospheric warming events
Stray, Nora Henriette; Orsolini, Yvan; Espy, Patrick Joseph; Limpasuvan, Varavut; Hibbins, Robert (Journal article; Peer reviewed, 2015-05-04)This study investigates the effect of stratospheric sudden warmings (SSWs) on planetary wave (PW) activity in the mesosphere–lower thermosphere (MLT). PW activity near 95 km is derived from meteor wind data using a chain ... -
SuperDARN Observations of Semidiurnal Tidal Variability in the MLT and the Response to Sudden Stratospheric Warming Events
Hibbins, Robert; Espy, Patrick Joseph; Orsolini, Yvan; Limpasuvan, Varavut; Barnes, R. J. (Journal article; Peer reviewed, 2019)Using meteor wind data from the Super Dual Auroral Radar Network (SuperDARN) in the Northern Hemisphere, we (1) demonstrate that the migrating (Sun‐synchronous) tides can be separated from the nonmigrating components in ...